What is most common ankle sprain?

The most common ankle sprain is an inversion sprain, which occurs when the foot rolls inward, stretching or tearing the ligaments on the outside of the ankle. This type of sprain is often caused by stepping on an uneven surface or rolling the ankle while playing sports. Inversion sprains are typically graded on a scale of 1 to 3, with grade 1 being the least severe and grade 3 being the most severe.